icedtea6: fix "make distclean"

[Andrew Haley]

"make distclean" fails if run more than once.  Fixed thusly,
committed as trivial/obvious.

Andrew.


changeset:   2540:6bf942777964
tag:         tip
user:        aph
date:        Tue May 03 12:50:36 2011 +0100
summary:     Don't fail if sed command to clean jvm.cfg fails.

diff -r 6b2f514d7874 Makefile.am
--- a/Makefile.am       Mon May 02 12:05:50 2011 -0400
+++ b/Makefile.am       Tue May 03 12:46:37 2011 +0100
@@ -1845,7 +1845,7 @@

 clean-add-jamvm:
        rm -rf $(BUILD_JRE_ARCH_DIR)/jamvm
-       sed -i 's#-jamvm KNOWN#-jamvm ERROR#' jvm.cfg
+       -sed -i 's#-jamvm KNOWN#-jamvm ERROR#' jvm.cfg
        rm -f stamps/add-jamvm.stamp

 stamps/add-jamvm-debug.stamp: stamps/icedtea-debug.stamp stamps/jamvm.stamp